add DN No. in Customer Receivable Aging report

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Dear all,

would like to ask if it is possible to add the DN no. in the Customer Receivable Againg report ?

i tried, but seems it is impossible to do so, even i set the field as System Variable and variable no. to 1 (as the DN no. in the Delivery module is '1'). i wonder it is because there is no linkage between the customer receivable againg module and the the delivery module.